Just a 10 percent shift in the salt concentration of your blood would make you very sick. To keep that from happening, the body has developed a finely tuned physiological circuit that includes information about that and a beverage's saltiness, to know when to signal thirst.
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Person undergoing a CAT scan in hospital with PET scan equipment. Emerging studies report findings of brain deterioration in females to be slower than that of males'.
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A colorized image of a brain cell from an Alzheimer's patient shows a neurofibrillary tangle (red) inside the cytoplasm (yellow) of the cell. The tangles consist primarily of a protein called tau.
Researchers say human brains can become overwhelmed by cute traits, such as large eyes and small noses, embodied by movie characters like Bambi.
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